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s390/cpacf: Unpoison instruction results

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Stop KMSAN from complaining about CPACF outputs being uninitialized.

Do not unpoison variable-length parameter blocks: mapping function
codes (like CPACF_KIMD_SHA_256) to lengths will be ugly. So let the
callers do this once the need arises.

Also do not touch cpacf_kma(): this wrapper does not handle cc 1 and
cc2 at the moment and has to be reworked.

Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Ilya Leoshkevich 2026-08-14 14:15:25 +02:00 committed by Heiko Carstens
parent ca1f4a5eca
commit b00c10948f
1 changed files with 6 additions and 0 deletions
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6
arch/s390/include/asm/cpacf.h
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@ -301,6 +301,7 @@ static __always_inline void __cpacf_query(unsigned int opcode,
cpacf_mask_t *mask)
{
__cpacf_query_insn(opcode, mask, CPACF_FC_QUERY);
kmsan_unpoison_memory(mask, sizeof(*mask));
}
static __always_inline int __cpacf_check_opcode(unsigned int opcode)
@ -370,6 +371,7 @@ static __always_inline int cpacf_query_func(unsigned int opcode,
static __always_inline void __cpacf_qai(unsigned int opcode, cpacf_qai_t *qai)
{
__cpacf_query_insn(opcode, qai, CPACF_FC_QUERY_AUTH_INFO);
kmsan_unpoison_memory(qai, sizeof(*qai));
}
/**
@ -422,6 +424,7 @@ static inline int cpacf_km(unsigned long func, void *param,
[opc] "i" (CPACF_KM)
: "cc", "memory", "0", "1");
kmsan_unpoison_memory(dest, src_len - s.odd);
return src_len - s.odd;
}
@ -454,6 +457,7 @@ static inline int cpacf_kmc(unsigned long func, void *param,
[opc] "i" (CPACF_KMC)
: "cc", "memory", "0", "1");
kmsan_unpoison_memory(dest, src_len - s.odd);
return src_len - s.odd;
}
@ -587,6 +591,7 @@ static inline int cpacf_kmctr(unsigned long func, void *param, u8 *dest,
[opc] "i" (CPACF_KMCTR)
: "cc", "memory", "0", "1");
kmsan_unpoison_memory(dest, src_len - s.odd);
return src_len - s.odd;
}
@ -619,6 +624,7 @@ static inline void cpacf_prno(unsigned long func, void *param,
: [fc] "d" (func), [pba] "d" ((unsigned long)param),
[seed] "d" (s.pair), [opc] "i" (CPACF_PRNO)
: "cc", "memory", "0", "1");
kmsan_unpoison_memory(dest, dest_len);
}
/**